saving the arrangement of my viewport
You can save a custom workspace by clicking on the little plus icon in the Header and choose Duplicate Current. (From looking at your screenshot I believe that is what you did already.) It will then be added to the Header and you can rename it by double clicking on it.
To save it, simply save your .blend file. This will allow you to re-open it in another .blend file by appending it.
Go to File &gt; Append (or Shift + F1 ). Locate the file you saved the Workspace in and double click on it. Open the folder titled &quot;WorkSpace&quot; and double click on the the custom workspace you made. It will now be added to the Workspace Header of the .blend file you are currently working in.
Ctrl + PageUp flips through the workspaces in the Header from left to right, whereas Ctrl + PageUp flips through them from right to left.